setup-gh

#!/usr/bin/env bash

set -euo pipefail

ensure_tool() {
  local -r tool="${1}"
  if ! type "${tool}" >/dev/null 2>&1; then
    echo "missing required tool: ${tool}"
    exit 1
  fi
}

setup_for_darwin() {
  ensure_tool brew

  brew install gh
}

setup_for_debian() {
  ensure_tool curl
  ensure_tool dpkg
  ensure_tool jq
  ensure_tool wget

  local -r repo="cli/cli"
  local -r url_pattern="linux_amd64.deb"
  local -r url=$(curl -s "https://api.github.com/repos/${repo}/releases/latest" | jq -r --arg pattern "${url_pattern}" '.assets | map(.browser_download_url) | map(select(. | test($pattern)))[0]')
  local -r filename=$(basename "${url}")

  cd /tmp

  wget --continue --quiet --show-progress --timestamping "${url}" -O "${filename}"

  sudo dpkg --install "${filename}"
}

setup_gh() {
  case $OSTYPE in
    darwin*)
      setup_for_darwin;;
    linux*)
      setup_for_debian;;
    *)
      echo "Unknown OS!"
      exit 1;;
  esac
}

setup_gh